Effects of Texture Bottom Profile on Static and Dynamic Characteristics of Journal Bearings

Peng Li,Fang Zeng,Dong Zhen,Hao Zhang,Sen Xiao,Zhanqun Shi,Hulun Guo

doi:10.1155/2021/7068744

Abstract

The purpose of this paper is to numerically study the effect of texture bottom profile on static, dynamic, and stability performance parameters of hydrodynamic journal bearings. The different performance parameters of square textured journal bearings with different bottom profiles are numerically investigated and compared with those of smooth journal bearing. There are five bottom profiles of this square texture: flat, curved, isosceles triangle (T1), oblique triangle (T2), and oblique triangle (T3). The static and dynamic coefficients are calculated by solving the steady-state Reynolds equation and the perturbation equations with FDM numerical technique. The performance characteristics under different texture distribution, depth, and bottom profiles are studied, and the current numerical results show that the selection of texture parameters is crucial to improve the static, dynamic, and stability performances of hydrodynamic journal bearing. Meanwhile, it is also found that the square texture with a flat bottom profile has a higher improvement in the values of static performance parameters in comparison to those other bottom profiles. Moreover, the simulation results indicate that the dynamic and stability performances improvement of textured journal bearing is also significant, especially when the eccentricity ratio is smaller.

Highlights

Singh and Awasthi [34, 35] numerically investigated the effects of texture parameters on the static, dynamic, and stability performances of journal bearings with cylindrical, spherical, triangular, and kite textures; the results show that the performance parameters were significantly improved when the texture distribution is in the pressure rising region of bearings
For the verification study the static and dynamic performance characteristics of partially textured journal bearing with texture region located at rising pressure region, Figure 4 presents the results of comparison of the current model compared with Singh and Awasthi [34], It is important to emphasize that because of the external
The effects of a square texture with flat, curved, isosceles triangle (T1), oblique triangle (T2), and oblique triangle (T3) bottom profiles on the static, dynamic, and stability performance parameters of journal bearings are numerically studied at different texture distribution and depth

Summary

Introduction

Researchers [17,18,19] used a multiobjective optimization method to optimize the texture parameters of the microgrooved journal bearing to obtain greater load-carrying capacity and smaller friction coefficient. The effects of triangular-shaped and chevron-shaped textures on the static, dynamic, and stability performances of journal bearings have been studied, and the optimal performance parameters have been found by researchers [29,30,31,32]. Rahmani et al [38, 39] numerically studied the tribological performances of flat bottom textured journal bearing and found the maximum load-carrying capacity and minimum friction coefficient than those triangular profiles. It should be noted that the selection principle of the texture optimal design parameters is not universal because the improvement of tribological performance is closely related to the operating conditions [44]

Objectives

Methods

Results

Conclusion